I tried to replicate the problem on my quad core Win10 machine but I was not successful.
This won't help but will provide me some extra assurance that prime95 is calling hwloc's set_affinity routine properly. In prime.txt set AffinityVerbosity=2 and restart. As before, post the picture of prime95 starting up.
One other user reported a nearly identical problem several months ago (or is this your second bug report?). At this point, I'm stumped.
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